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    <p>This response is by design as a security measure, and is the result of reaching the <strong>max_connection_errors</strong> value for mysql. <a href="http://docs.oracle.com/cd/E17952_01/refman-5.0-en/communication-errors.html" rel="nofollow" title="Oracle's resource on this">Here's a link</a> Oracle provides which details most of the possible causes and solutions.</p> <p>Ultimately this means that there are so many successive connection failures that MySql stops responding to connection attempts. </p> <blockquote> <p>I use a cron, every 5 minutes which does a mysqladmin flush-hosts command.</p> </blockquote> <p>As you are reaching this limit so quickly, there are only a few likely culprits:</p> <ol> <li>Server is not correctly configured to use PDO.</li> <li>Running code includes very frequently creating new connections. <ul> <li>Results in quickly reaching the <strong>max_connections</strong> value, causing all subsequent connection attempts to fail... thus quickly reaching the <strong>max_connection_errors</strong> limit.</li> </ul></li> <li>Code is hitting an infinite loop, or cascading failure. <ul> <li>Obvious possibility, but must be mentioned. </li> <li>(i.e: pageA calls pageB and pageC, and pageC calls PageA)</li> </ul></li> <li>PDO is running fine, but some scripts take a long time to run, or never end. <ul> <li>Easiest way to catch this is turn down the <strong>max_execution_time</strong>.</li> </ul></li> </ol> <p>It is likely that whatever the case, this will be difficult to track down.</p> <ol> <li>Log a stack-trace of every mysql connection attempt to find what code is causing this.</li> <li>Check the mysql.err logfile</li> </ol> <p>While PDO does not require explicitly closing mysql connections, for cases like this there's a few practices that can prevent such ServerAdmin hunts.</p> <ul> <li>Always explicitly close mysql connections. <ul> <li>Build a <a href="http://edrackham.com/php/simple-php-mysql-class/" rel="nofollow" title="edrackham.com">simple Class</a> to handle all connections. Open, return array, close.</li> <li>The only time you need to keep a connection open is for cursors.</li> </ul></li> <li>Always define connection arguments in one and only one file included everywhere it is needed.</li> <li>Never increase <strong>max_execution_time</strong> unless you know you need it and you know the server can handle it. <strong>IF</strong> you need it, explicitly increase the value only for the script that needs it. <em>php.net/manual/en/function.set-time-limit.php</em> <ul> <li>If you increase <strong>max_execution_time</strong>, increase <strong>max_connections</strong>.</li> </ul></li> </ul> <p>dev.mysql.com/doc/refman/5.0/en/cursors.html</p>
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    1. POWhat are "many successive interrupted connection requests" in MySQL?
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    1. USTony Chiboucas
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